"On a beautiful, warm afternoon, I watched a group of dogs frolic in a dog park. Suddenly, I heard a woman’s high-pitched yelp, followed by the pounding of human feet. There was no need to look; it ...

In Canine Confidential: Why Dogs Do What They Do, I wrote about two dogs I called Harry and Helen, the "happy jumpers," who unhesitatingly would jump on other dogs, from all different orientations, ...